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Redox - Coggle Diagram
Redox
Reactivity
An oxidizing agent is an element which causes oxidation (and is reduced as a result) by removing electrons from another species.
A reducing agent is an element which causes reduction (and is oxidized as a result) by giving electrons to another species.
A more reactive metal will displace a less reactive one from a compound and a more reactive halogen will displace a less reactive one from a compound.
This can be generalized to say a stronger reducing agent will displace a weaker one from a compound, and a stronger oxidizing agent will displace a weaker one from a compound.
If an oxidising agent is placed with a reducing agent then they are likely to react. The feasibility of a reaction can be estimated from the substances positions in a reactivity series.
Oxidation
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If an element is oxidized, its oxidation number will go up (get more positive).
Electrolytic Cells
Greater electromotive force is applied from the external circuit using a battery or power source and this forces the species within the cell to perform the reverse reaction to that which they would normally tend to do.
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Conduction of current
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Electron leaves cathode and goes to positive ion (making it neutral and releasing it from the liquid)
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Voltaic Cells
Voltaic cells generate electricity from chemical reactions that occur at the electrodes in the cell. The cell can be described in terms of two 'half-cells'.
The salt bridge is there to allow ions to pass through from one half cell to the other so that the half cells do not develop an electrical charge.
Reduction
If an element is reduced, its oxidation number will go down.